C1214

EBCM/ABS Relay Schematic:

CIRCUIT DESCRIPTION
Ignition voltage is supplied to terminal 85 of the ABS relay. The Electronic Brake Control Module (EBCM) is then able to energize the pull-in coil by completing the ground circuit at EBCM terminal D6. The magnetic field created closes the ABS relay contacts and allows battery voltage and current to be supplied to the EBCM. In addition, the EBCM supplies power to the motors and ABS solenoids.

CONDITIONS FOR SETTING THE DTC
This Diagnostic Trouble Code (DTC) will set when the following conditions are met:
^ Voltage in the switched battery input circuit to the EBCM falls below 7.05 volts (CKT 9B01).
^ This DTC can be set anytime.

NOTE: This DTC may take up to 2 seconds to set because it takes time for the ABS relay voltage to decay.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS is disabled, and the amber ABS indicator lamp is turned ON. The red BRAKE warning lamp is turned ON if the rear piston in the motor pack is not expected to be in the home position.

CONDITIONS FOR CLEARING THE DTC
Conditions for the malfunction are no longer present and the Tech 2 scan tool Clear DTC Information DTCs function is used. One hundred drive cycles have passed with no malfunctions detected.

DIAGNOSTIC AIDS
The following list contains items that need to be inspected when diagnosing this system:
^ Open ABS fuse.
^ Faulty ABS relay (contacts open/high resistance).
^ Poor harness terminal contacts to the ABS relay (look for spread terminals).
^ Faulty electrical circuits (open or high resistance) between the ABS relay and the EBCM (CKT 9B01) and/or between the ABS fuse and the ABS relay (CKT 9A01).

An Intermittent Malfunction - is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

The Frequency Of The Malfunction - is most likely checked by using the Enhanced Diagnostic function of the Tech 2 scan tool, as described in Enhanced Diagnostics.

Inspect The Following Harness Connectors For - backed out terminals, improper mating, broken lock, improperly formed or damaged terminals and for poor terminal-to-wire connection before component replacement:
^ ABS relay connector.
^ EBCM connectors C1 and C2.

NOTE: If DTC C1214 only sets when the vehicle is initially started in cold ambient conditions (temperature less than 0�C [32�F]), replace the ABS relay.

DTC C1214 ABS Relay Contact Circuit Open (Part 1 Of 2):

DTC C1214 ABS Relay Contact Circuit Open (Part 2 Of 2):

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
[2] If ABS relay coil circuit is open, the ABS relay contacts will stay open. Therefore, follow DTC C1216 prior to diagnose this DTC.
[4] Checks voltage input to the (CKT 9B01).
[5] Checks ABS relay for open contacts when relay is turned ON.
[6] Checks for open in CKT 9A01 (power to the ABS relay).
[7] Checks for an open in CKT 9B01.
[8] Checks for short to ground in CKT 9A01
[9] Checks for short to ground in CKT 9B01
[10] Confirms if this DTC resets after 2 drive cycles.